USPC Class Details

Description: 257 active solid-state devices (e.g., transistors, solid-state diodes) / 257 active solid-state devices (e.g., transistors, solid-state diodes)/(107) regenerative type switching device (e.g., scr, comfet, thyristor) (133) combined with field effect transistor (139) with extended latchup current level (e.g., comfet device) (145) low impedance channel contact extends below surface

Hierarchy/Derived subclasses

257 / 107

-> 133

-> 139

-> 145

uspto searches

Patent Apps in 257/145

Granted Patents in 257/145

Use the links above or do an advanced search in ppubs for:
(257/145.ccls.)

This will show what classes derive from the input. Ex: entering 43/42.24 shows the derived classes and the search that can be used to find patents or patent applications in those subclasses.

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